LANraragi
is a web manager for manga/doujinshi archives, with a built-in reader and namespace/tag support.
It's built using Perl and the excellent Mojolicious Framework.

DoujinSoft
is a browseable archive for content made for the 2010 Nintendo DS game WarioWare DIY.
It's built in Java, leveraging the reverse-engineering efforts made on the game.

RSS Live Tiles
is a Universal Windows Platform application made for displaying entirely customizable content in Start Menu
Live Tiles, using RSS feeds as data sources.
It uses C# and serves as my testbed for new stuff landing on the Windows 10 SDK.